Friction-gear.



S. E. HASELTHJE.

FRCTION GEAR,

APPLICATION FILED my 1o |915.

Paenf Mm. M2 WM .7. SHEETSKSHEET 1.

@a A TTOR Y S. B. HASELTINE.

FRICTION GEAR.

APPLICATION FILED MAY Io, I9I5.

Patented Mar, 12, 1918.

2 SHEETS-SHEET 2.

IA'VENTOR. zhy @jene B 1' I YW I ATTQRNEI/ -vide an arrangement. of wedges,

STAG?? B. HSELTINE, OF CHCAGO,

ILLNOS, ASSIGN'OR T0 WILLIAM H. MINER, 0F

enana', new Yoan.

FMCTIGN-GEAR.

Specification of Letters Patent.

Patented Mann, i2, illll.

Application filed May 10, 1915. Serial No. 27,005.

To all whom t may concern.'

Be it known that l, STACY B. HASELTINE, a citizen of the United States, residing at Chicago, in the county of Cook and State of lllinois. have invented a. certain new and useful Improvement in Friction-Gears, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to improvements .in friction gears.

rThe object of the invention is to provide a friction gear for railway draft rigging having high capacity, certain release, and so arranged that the pressure from the wedges to the friction shoes is distributed evenly to the latter.

A nother object of the invention is to profriction shoes and shell wherein anti-friction rollers employed that extend lengthwise of the gear.

The invention furthermore consists in the improvements in the parts and devices, and in the novel combinations of the parts and devices herein shown, described, or claimed.

En the drawing forming a part of this specification, Figure l is a longitudinal vertical sectional view of a draft rigging-showing my improvements in connection therewith. Fig. 2 is an enlarged view of the friction sheli and cooperating wedges and shoes showing the parts in full compression. Fig. 3 is an end elevation of the friction ear with the outer wedge block removed, the bolt being shown in section. Fig. 4- is a sectional view taken on the line it-li of Fig. 2. Fig. 5 is a detailed view of the combined inner Wedge block and spring follower. Fig. 6 is a detailed perspective view of one of the friction shoes, and Fig. 7 is a detailed perspective view of one of the secondary or auxiliary members.

in said drawing, 10 denotes the center or draft sill of a railway car to which are secured the rear and front stops ll and l2. The draw-bar 13 is Keyed to a hooded cast yoke le in the usual manner, the parts being supported as shown, by a saddle plate l5.

The friction gear proper is designated generally by the reference letter A., and as shown, comprises a combined friction shell and cylinder lo having an integral rear wall l?, which acts as a rear follower, the wall i7 being provided with a hollow inwardly extending boss 18. Cooperating with the friction shell proper, are a plurality of circular-ly arranged friction shoes 19 each of which has an exterior curved friction surface 20, cooperating with the corresponding curved internal friction surface of the shell.

Each shoe is also provided at its end with an inwardly extending rib or iiange 21 for a. purpose hereinafter described. @n their inner faces the shoes are also provided with a pair of longitudinally extending wedging faces 22-22, one near each edge of the shoe. For spreading the shoes and thereby creating friction, T have providedan outer wedge block 28, an inner combined wedge block and spring follower 24, and a plurality of longitudinally arranged auxiliary or secondary wedge members 25-25, the latter corresponding in number to the number of friction shoes. Each of the wedging elements 25 is provided with beveled-wedging ends 26 and 27 coperating respectively with the beveled wedging ends 28 and 29 of the outer and inner wedge blocks 23 and Q4. Each wedging element 25 is also provided with a pair of longitudinally extending wedging faces 30Min) on their outer sides disposed opposite the corresponding wedging faces 22-22 of two adjacent friction shoes. interposed between each wedge member 25 and two friction shoes, are longitudinally extending anti-friction rollers f3 l-3 l. the latter being held in proper position by means of shoulders 3?-32 on the corresponding wedge members 25. The wedge members 25 are normally spaced slightly apart, as clearly indicated in the various figures of the drawing, and the same are also suitably recessed along their inner faces as indicated at 33 to provide clearance for the connecting or tension bolt Si which passes therebetween and through the wedge blocks Q3 and 24 and the boss 18. The inner combined wedge block and spring follower 24e is provided with an annular extending groove 35 into which fit the flanges or shoulders 2l of the friction shoes. The wedge block 9.4 is also provided with an annular flange 36 engaging 'the inner ends of the friction shoes, the construction. thusadescribed serving to lock the friction shoes and inner wedge block together so that the same will always move substantially taneously inwardly or outwardly. For resinfiuln Y sisting movement of the friction elements, ll

l have provided a main spring which in the form shown, comprises an outer heavy coil 37 and a nested inner coil 38.

The operation is as follows: Upon pres sure applied to the outer wedge block 23 from the front follower 39, the secondary wedge members :'25 will be forced outwardly or radially of the gear, their longitudinal movement relatively to the friction shoes being prevented because of the fact that the inner wedge block 24 cannot be displaced in this direction. The outward or radial movement of the wedge members in turn presses the friction shoes outwardly or radially, the tendency being to enlarge the circle formed by the outer faces of the friction shoes. In this movement, it will be apparent that the outward thrust against the shoes from the vwedge members is distributed to the shoes over a relatively large area, that isover the entire length of the anti-friction rollers 31 proper. As the pressure is applied to the wedges and inward movement is resisted by the spring, the pressure of the friction shoes aga-inst the friction shell is gradually increased. Upon release, it is evident that the set of auxiliary wedge members 25 will collapse and thereby relieve the pressure between the friction shoes and the shell so that the expansion of the main springwill force all the parts outwardly.

From the foregoing description it will be seen that with my arrangement l am enabled to employ relatively blunt angles between the wedge blocks 23 and 24. and the ends of the secondary wedges 25, thus insuring certain release and at the same time am enabled to use relatively acute or sharp angles between the wedging faces of the members 25 and friction shoes, thereby creating an immense pressure.

Although lhave herein shown and described in detail one embodiment of my invention, yet l do not wish to be limited to the exact construction shown inasmuch as believe it to be broadly new to employ antifriction rollers arranged longitudinally of the shell or with the axes of the rollers substantially parallel with the center line of the gear, and l desire to claim the same broadly and contemplate all changes and modications that come within the scope of the claims appended hereto.

l claim:

l. A friction gear comprising a friction shell, friction shoes coperable therewith, a spring. a. plurality of wedging members cooperating' with said shoes, and anti-friction rollers interposed between some of. said wedging members and said shoes, the axes of Said rollers extending parallel to the axis of the shell.

2. A frictional shock absorbing mechanism comprising a friction shell, friction Leases? shoes coperable therewith, a spring, a plurality of wedging members coperable with the shoes, and a plurality of anti-friction rollers arranged lengthwise of the shoes and interposed therebetween and some of said wedging members. f

3. A friction gear comprising a friction shell, friction shoes coperable therewith, a spring, a plurality of wedge members within the shoes and arranged to move radially of the shell to force the friction shoes outwardly, a spring follower engaging the inner ends of said wedge members, a wedge block engaging the outer ends of said wedge members, and coperablc, interlocking means on said shoes and spring follower arranged to prevent independent longitudinal movement of the spring follower and shoes.

4. A friction gear comprising a friction shell, friction shoes, a spring, outer and inner wedge blocks, secondary wedge members between said blocks and said shoes, and

means preventing relative longitudinal movement between the inner wedge block and said shoes.

5. A friction gear comprising a friction shell, friction shoes, a spring, outer and inner wedge blocks, secondary wedge members between said blocks and said shoes, and means preventing relative longitudinal movement between the inner wedge block and said shoes, said means including intertting grooves and flanges.

6. A friction gear comprising, a friction shell, a plurality of friction shoes coperable therewith, a spring, a spring follower at the inner end of said shoes and having wedge surfaces, a plurality of longitudinally arranged wedge members located within the shoes and coperable therewith, and also with the wedge surfaces of said spring follower, and an outer wedge block coperable with the outer ends of said wedge members and varranged to spread the same radially.

7. A friction gear comprising a friction shell, friction shoes, a spring, inner and outer wedge blocks, a plurality of wedge members within said shoes and interposed between said blocks and coperable therewith and a plurality of anti-friction rolls extending lengthwise of the shoes and interposed therebetweenand said wedge memers.

8. A friction gear comprising a friction shell, friction shoes, an outer wedge block, a plurality of longitudinally arranged wedge members disposed within the shoes, an inner wedge block coperable with said wedge members, and intertting means on said inner wedge block and said shoes, arranged to cause the inner wedge block and shoes to move simultaneously.

9. A friction gear comprising a friction shell, a plurality of circularly arranged friction shoes within said shell, said shoes each having a pair of oppositely arranged, lfritu'dinally extending wedge faces on their lnner sides, a spring, a plurality of wedge members located within said shoes and having each a pair of longitudinally extending wedge faces, and means for spreading said wedge members radiallyl when the gear is actuated.

10. A friction gear comprising, a friction shell, friction shoes, a spring,inner and outer wedge blocks, a plurality of wedge members interposed between said blocks, said wedge members and friction shoes having coperating longitudinally extending wedging faces and a plurality of anti-friction elementsinterposed between said wedging faces.

lon-

11. A friction gear comprising a friction shell, friction shoes, a spring, inner and outer wedge blocks, the inner block also serving as a follower for said spring, a plurality of wedge members interposed between said blocks and coperable therewith, and a plurality of anti-friction rollers interposed between said wedge members and said shoes, the axes of said rollers extending substan= tially parallel with the center line of the f gear.

STACY B. HASELTINE. 

